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a2ff38d818
This cleans the page handling when having to make an area copy-on-write; regions belong to vm_cache_ref, pages to vm_cache. Added prototype for new call vm_copy_area(). Fixed some return types. git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9263 a95241bf-73f2-0310-859d-f6bbb57e9c96